> How can one know if a book is ­interesting until one has read it; memorable until time has or has not lodged it in one’s memory; rereadable until the decades pass and one feels the need to read it again and enjoys it all the more on doing so?

Well, 'interesting' is an opinion that an individual forms after having experienced something. In other words, there is no way for someone to not ever read an 'uninteresting' book. They must first read, to find out.